Histology of the Respiratory System

	HISTOLOGY OF RESPIRATORY SYSTEM ©David B. Fankhauser, Ph.D., Professor of Biology and Chemistry University of Cincinnati Clermont College, Batavia OH 45103
bronchiole 100x	This page has been accessed times since 30 April 2002. 16 April 1990, rvsd, 21 Apr 94, 27 Mar 95, 20 Apr 95, 23 Mar 96, 1 Apr 97, 29 Mar 98, 28 Mar 00, 28 Mar 01, 23 Mar 02	edge of lung alveoli 400x

Examine the following slides and illustrate the views, labeling the specified features. The page numbers (VE) are in di Fiore's Atlas of Normal Histology, 9th Ed:

	Trachea, c.s., Slide 5 (H 2430), VE: p. 243, 40x Layers: 1) (pink)pseudostratified ciliated columnar epithelium and lamina propria 2) (bluish-purple) tracheal rings, composed of hyaline cartilage 3) (pink) adjacent layers of perichondrium 4) (bluish) another layer of hyaline cartilage 5) (pink) adventitia: connective tissue surrounding the trachea
Here is a labeled view of tracheal histology.	Trachea, c.s., Slide 5 (H 2430), VE: p. 243, 400x: pseudostratified ciliated columnar epithelium cilia goblet cell basement membrane lamina propria tracheal glands: secrete mucus mucous alveoli: large pale blue-gray cytoplasm, nuclei at periphery ducts of tracheal glands (lined with simple cuboid) perichondrium hyaline cartilage chondrocytes
	bronchus: VE: p. 247, at 40x: This overview shows the bronchus embedded in a field of aveoli.
Here is a labeled view of a bronchus.	bronchus: find one with noted features, VE: p. 247, at 100x: alveoli bronchus or bronchiole: significance or characteristics: mucosal folds pseudostratified ciliated columnar epithelium lamina propria connective tissue underlying mucous membrane smooth muscle forms a smooth pink ring outside mucosa adventitia often filled with lymphoid tissue lymph node nuclei numerous, stained blue-purple pulmonary artery thick walled pulmonary vein thin walled, collapsed, if present
	bronchus: VE: p. 247, at 400x: mucosal folds are clear pseudostratified ciliated columnar epithelium is more distinct lamina propria connective tissue underlying mucous membrane smooth muscle forms a smooth pink ring outside mucosa
	Lung, l.s., Slide 4 (H 2460), page 245 & 247: at edge of lung: at 400x visceral pleura mesothelium covering the surface of the lung alveoli blood vessel (hard to spot, incorporated into alveolar wall, look for RBCs.) respiratory bronchiole, if present (lined with cuboid epithelium)
	Lung, l.s., Slide 4 (H 2460), page 245 & 247: at edge of lung: at 600x Look carefully and you can see erythrocytes in the lower right of the alveolus. Here is a labeled view of the edge of the lung.